Connecting rod regrinding machine



Dec. 12, 1944. 3 A GERBK, 2,365,068

CONNECTING ROD REGRINDING MACHINE Dive/liar Dec 12,, 19440 CONNECTINGHOD REGRINDING MACHINE Filed Feb. '7, 1942 4 Sheets-Sheet 2 1 56 f n54-j fl N v if? 62- 4mm a Inventor 41- 45 Swim 3y fl. fi e/6% l i s. A.GERBIG 2,365,068

Dec. 12, 1944. g GERBlG 2,3@5,@68

CONNECTING ROD REGRINDING MACHINE Filed Feb. '7, 1942 4 Sheets-Sheet 5i944- 5A. GERBEG CONNECTING ROD REGRINDING MACHINE Filed Feb. '7, 1942 4Sheets-Sheet 4 IIHHETR I uueutor Patented Dec. 12, 1944 4 UNITED STATESPATENT OFFICE CONNECTING ROD REGRIN DING MACHINE I SidneyA. Gerbig,Faribault, Minn. 7 Application February 7, 1942, Serial No. 429843 1Claim. (c1. .29-'2 6) This invention relates to new and usefulimprovements in grinding machines, and more particularly to the machinefor reconditioning insert-type connecting rods; such as are used inpresent day automobile engines.

The principal object of the present invention is to provide a grindingmachine which includes a boring bar mounted in such a manner as to becooperative with a portion of the operating mechanism that is used inthe operation of grinding.

Another important object of the invention is to provide a machine of thecharacter stated which includes a rotary work support which can be usedeither in conjunction with a boring element or with a grinding element.

Other important objects and advantages of the invention will becomeapparent to the reader of the following description.

In the drawings: 7

Figure 1 represents a side elevational view of the machine.

Figure 2 is a front elevational view of the ma- 7 chine.

Figure 7 is an inside elevational view of the ad- 1 -justab1e grindercarrier.

Figure 8 is a fragmentary detailed end elevational view of the spindlefor the work table and feed means for the boring bar.

Figure 9 is a vertical. sectional View through the cylinder used forfeeding the boring bar Referring to the drawings wherein like nu.-merals designate like parts, it can be seen that numeral 5 (see Fig. 4)is a substantially G- shaped frame having a horizontally disposed topportion 6 and a laterally disposed upstanding stump portion 1. Thisframe 5 is preferably a casting and is rimmed by a flange 8 to whichcertain elements of the machine are attached.

Extending downwardly from the top of the stump 1 is a cylindricalhousing 9 in which a b hollow spindle I0 is located. This spindleexreceives the upper end of the spindle I0.

Numeral l9 denotes a work supporting table which is preferably ofcircular shape, the same having a central hub 20 from which reinforcingfins or 'webs 2| radiate to the periphery of the table. A skirt 22depends from the hub and Suitable securing" means can be providedbetween the skirt 22 and the'spindle Ill.

A chip or smallp'article discharge opening 23 is formed in the hubportion of the table 19.

A bore is located through the hub portion 20 to receive a boring bar 24which extends upwardly through a rest ring 25 which circumscribes thebore of the hub 20 and rests upon the table. It is upon this ring 25that the bearing end a of a connecting rod 1) is disposed and held byclamp plates 26. These clamp plates each has one of its ends resting ona riser 21 while its other end rests on the bearing a and threaded studs25 rise from the ring 25 and through openings in the plate 26, the samebeing equipped with nuts 28. Thus, the clamp plates 26 can be clampedagainst the bearing a to hold the bearing in place.

The bearing a is the usual main bearing of the connecting rod 1), while(2 denotes the wrist pin bearing, this bearing being disposed over apintle 30 which rises from a gauge plate 3| slidable within a guide 32,32. A threaded member 33 rises through a slot 34 in the gauge plate 3|and is equipped with a nut 35 to the end that the nut can be tightenedto secure the plate 3| in any desired adjusted position, there being agauge or row of graduations 36 on the plate 3| to facilitate preciseadjustment of the plate 31 and consequently the bearing a with respectto the boring bar 24.

The lower end of the boring bar 24 is connected by a pivotal yoke 31 toa drive shaft 38 operating through bearings 39, 40. An arm 4| extendslaterally from the shaft 38 and is connected pivotally, as at 42, to apiston rod 43, this rod being connected to a piston 44 in a cylinder 45which has fluid pressure conduits 46, 4? connected to the ends thereof.This cylinder 45 is used and the air or fluid pressure theretocontrolled to the extent desired in feeding the boring rod 24 up wardlyand downwardly. As can be'seen in Figure 4, a cutting tool 48 isprovided-at the upper end of the bar 24.

Obviously, the cutting tool end of the bar 24 can be lowered into therecesses 23 whenever it is desired to use the grinder generally referredto by numeral 50. This grinder 50 comprises a mo tor 5| having anarmature shaft 52 equipped with a grinding element 53. The motor 5| issecured to carriage 54 which is slotted at its inner side as at 55. Thecarriage plate 54 at one side of the slot 55 is formed with rack teeth56 meshing with a pinion 51 located on a shaft 58, this shaft alsohaving a bevel gear 59 thereon located in a pocket 60 of a slide body6|. The carriage plate 54 has dovetail grooves 62, 62 therein forreceiving correspondingly shaped ribs 63, 63 on the slide body 6|.

A transversely extending shaft 64 extends into the slide body 6|,terminating at the pocket 60 where a beveled gear 65 is secured theretoand in mesh with the bevel gear 59. A hand wheel 66 is provided at theother end of the shaft 64 and the operation thereof results in rotationof the shaft 58 and upwardly or downwardly feeding of the carriage plate54 to lower or raise the grinding element 53 with respect to the work. v

The slide body 6| has an elongated pocket 61 in the intermediate portionthereof for receiving a nut 68 which rises from the top 6 of the frame5. A screw shaft 69 is disposed longitudinally in the slide body 6|, thesame having its threaded portion disposed through the nut 68, while itsouter end is provided with an operating wheel By rotating this wheel 10,the slide body 6| can be slid on the top portion 6 of the frame 5.

assumes A pivotal hand brake H is provided on the flange 8 of. the frame5 and can be operated against the periphery of the table H! to slow thesame up after power has been stopped.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, sizeand materials may be resorted to without departing from the spirit andscope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

IA machine of the character described comprising a rotary Worksupporting table, a boring bar endwise movable upwardly through thetable into work supported thereon and retractable out of the work, agrinding unit mounted above the table and constructed and arranged to belowered into work supported by the table when the boring bar isretracted, a hollow spindle for the table, drive means for the spindle,said boring bar being operative through the spindle, and means to movesaid bar endwise comprising a rock shaft, a yoke on one end of saidshaft operatively connected to the lower end of said bar, a crank on theother end of said shaft, and pneumatic means for operating said crank.

SIDNEY A. GERBIG.

